'Twelfth' definitions:

Definition of 'twelfth'

adjective

Coming next after the eleventh and just before the thirteenth in position [syn: twelfth, 12th]

noun

Position 12 in a countable series of things

noun

One part in twelve equal parts [syn: one-twelfth, twelfth, twelfth part, duodecimal]

From: GCIDE

Twelfth \Twelfth\ (tw[e^]lfth), a. [For twelft, OE. twelfte, AS. twelfta. See Twelve.]
1. Next in order after the eleventh; coming after eleven others; -- the ordinal of twelve. [1913 Webster]
2. Constituting, or being one of, twelve equal parts into which anything is divided. [1913 Webster]

From: GCIDE

Twelfth \Twelfth\, n.
1. The quotient of a unit divided by twelve; one of twelve equal parts of one whole. [1913 Webster]
2. The next in order after the eleventh. [1913 Webster]
3. (Mus.) An interval comprising an octave and a fifth. [1913 Webster]